There are different levels of emoji support - and I totally agree that "not crashing when emoji enter your systems" is a vital one to have these days - as is preserving those emojis unmangled.

For me the parent commenter's phrasing of "first class emoji support" goes rather beyond that, e.g. with friendly emoji pickers, maybe reaction emojis, custom emojis, different skin-tone emojis, etc.

I'd view that bigger level of support as extremely optional for a transaction processing company like yours, though less so for a chat system intended for broad appeal in 2018.